CVE-2020-11008mediumCWE-20

CVE-2020-11008: fallo de gravedad media en git

Malicious URLs can still cause Git to send a stored credential to the wrong server

Publicada el · Actualizada el

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Aviso por correo cuando entre en el KEV, tenga PoC pública o suba de nota.

13Vexday Risk Score

Sin señal de explotación. Ningún artefacto público de explotación conocido hasta ahora.

ssvc Trackcvss 4epss 3.9%
En resumen

Git puede ser engañado para enviar contraseñas almacenadas a un servidor controlado por un atacante al procesar URLs maliciosas especialmente preparadas. Esto ocurre porque Git envía información incompleta a los programas de almacenamiento de credenciales, que luego devuelven cualquier contraseña almacenada coincidente en lugar de rechazar la solicitud.

Detalle técnico

La interfaz de credential helper de Git puede recibir patrones de URL malformados (sin campos de hostname y protocolo) de URLs especialmente preparadas, causando que los helpers coincidan con cualquier credencial almacenada y filtren contraseñas sensibles. La vulnerabilidad se activa a través de git clone o sistemas automatizados como submódulos Git; la explotación depende de qué credential helpers estén configurados (los helpers store, cache y osxkeychain de Git son conocidos como vulnerables). El impacto incluye divulgación no autorizada de credenciales almacenadas a servidores controlados por atacantes.

Resumen generado y traducido por IA a partir de la descripción oficial.
Affected versions of Git have a vulnerability whereby Git can be tricked into sending private credentials to a host controlled by an attacker. This bug is similar to CVE-2020-5260(GHSA-qm7j-c969-7j4q). The fix for that bug still left the door open for an exploit where _some_ credential is leaked (but the attacker cannot control which one). Git uses external "credential helper" programs to store and retrieve passwords or other credentials from secure storage provided by the operating system. Specially-crafted URLs that are considered illegal as of the recently published Git versions can cause Git to send a "blank" pattern to helpers, missing hostname and protocol fields. Many helpers will interpret this as matching _any_ URL, and will return some unspecified stored password, leaking the password to an attacker's server. The vulnerability can be triggered by feeding a malicious URL to `git clone`. However, the affected URLs look rather suspicious; the likely vector would be through systems which automatically clone URLs not visible to the user, such as Git submodules, or package systems built around Git. The root of the problem is in Git itself, which should not be feeding blank input to helpers. However, the ability to exploit the vulnerability in practice depends on which helpers are in use. Credential helpers which are known to trigger the vulnerability: - Git's "store" helper - Git's "cache" helper - the "osxkeychain" helper that ships in Git's "contrib" directory Credential helpers which are known to be safe even with vulnerable versions of Git: - Git Credential Manager for Windows Any helper not in this list should be assumed to trigger the vulnerability.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N
Productos afectados
git · git
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